Cumulative Oil By Formation, 2009 vs 2010

Formation: 2009, Wells, Cum Oil, % ND Total ---> 2010, Wells, Cum Oil, % ND Total

(numbers rounded)

(selected formations)

Bakken: 1,566, 120 million, 6.9% ----> 2,338, 205 million, 11%
Bakken/Three Forks: 9, 0.19 million, 0.01% ---> 12, 0.67 million, 0.04%

Birdbear: 171, 18 million, 1% ---> 171, 18 million, 1%
Devonian: 137, 99 million, 5.7% ---> 137, 99 million, 5.4%
Duperow: 337, 50 million, 2.9% ---> 338, 50 million, 2.7%

Heath: 197, 66 million, 3.8% ---> 197, 66 million, 3.6%
Lodgepole: 48, 56 million, 3.2% ---> 49, 57 million, 3.1%

Madison: 5,469, 905 million, 52% ---> 5,505, 914 million, 49%
Red River/B:  1,220, 218 million, 12.4% ----> 1,238, 228 million, 12.4%

Sanish: 58, 13 million, 0.8% ---> 63, 14 million, 0.7%

Spearfish (3): 330, 54 million, 3.1% ---> 330, 54 million, 2.9%

Tyler (2): 87, 18 million, 1% ---> 88, 18 million, 1%


Totals:
2009: 10,245 wells, 1.7 billion barrels from 1951 - 2009

2010: 11,095 wells, 1.9 billion barrels from 1951 - 2010

Comments: At the end of 2010, North Dakota had produced a cumulative of 1.9 billion barrels of oil. The general consensus is that there are about 2 billion barrels of recoverable oil from the Bakken, and slightly less than 2 billion barrels from the Bakken/Three Forks. The increase from 1.7 billion barrels in 2009 to 1.9 billion barrels in 2010 represents a 13 percent increase in one year.